Charlesworth, who owns Downderry Nursery in Tonbridge, Kent has been working with German producers Helix Pflanzen towards selling his lavender in Germany under the Downderry brand.
Charlesworth and Hans Muller of Helix have been testing different lavenders for hardiness throughout the country, and over time they have found 30 which are likely to survive the harsher continental winters.
A display of the resulting plants will be created in the Downderry Lavender Garden at the Dehner garden centre headquarters in the Flower Park at Rain am Lech.
Planting will start this spring using Charlesworth’s hardier cultivars and will be available for the public to view later this summer.
Dehner is Europe’s largest garden centre group with over 100 centres in Germany and Austria, and employ more than 5,000 people, 1,000 of them at their flagship store in Rain.
Helix hold a national collection of Lavandula angustifolia with the German equivalent of Plant Heritage, Netzwerk Pflanzensammlungen and a part of that collection is formed by the Downderry plants.
Plant Heritage conservation officer Mercy Morris said: "I really am so pleased that we are working with collections held in Germany. Creating better international links between Collection Holders has been a passion of mine for some years, and I hope to see many more in the future."